Distances can be added to EventData via Event#Edit view.
EventData Attributes are shown in Event#Show view.
All EventData textfield-attributes can be entered via Event#Edit.
Moved event_data partial into own folder.
Put the show stuff into a partial too.
A minor change.
Added "empty" to text_attribute_show.
Added validations and a number_field partial.
Merge branch 'dev' of github.com:ASE-2014/spoodle into feature/event_data_crud
Merge branch 'feature/event_data_crud' into dev